This work sought to illustrate a scenario of alternatives to taxation, based on different methods of depreciation. The parameter was the forest transportation activity, being the study developed for the Bitrem truck. Cash flow was calculated before and after taxation, which values were determined on the basis of a percentage on the taxable income, varying according to the methodologies used for calculating depreciation. After drawing up the post-taxation cash flow, an economic study was carried out using Net Present Value (NPV). The impact of the income tax caused a reduction in NPV of 53.36%, 52.22%, 50.54%, 48.07% and 47.72% respectively when considering the following methods of depreciation: inverse sum of the digits ; sinking fund; linear; exponential and sum of the digits. The most suitable methodology for the forest truck was the same that gave the largest NPV (sum of the digits), indicating that the method adopted by the government can result in tax overload. This shows the need for establishing better taxation rules, using more suitable methods for these types of machines.
Taxes; depreciation methods; economic evaluation
